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SzieberthAdam/qgis_custom_label_autocentroid.txt

Created January 19, 2016 14:30
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QGIS: Label to centroid when position is not explicitely set
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qgis_custom_label_autocentroid.txt
# It is assumed that the layer has both "labelX" and a "labelY" attributes set as real number fields.
# Labels / Placement / Data Defined / Coordinate / X:
CASE WHEN "labelX" IS NULL THEN toreal(regexp_substr(geom_to_wkt(centroid($geometry)), '(-?\\d+\\.?\\d*) -?\\d+\\.?\\d*')) ELSE "labelX" END
# Labels / Placement / Data Defined / Coordinate / Y:
CASE WHEN "labelY" IS NULL THEN toreal(regexp_substr(geom_to_wkt(centroid($geometry)), '-?\\d+\\.?\\d* (-?\\d+\\.?\\d*)')) ELSE "labelY" END
# Labels / Placement / Data Defined / Alignment / horizontal:
'Center'
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